Internal Combustion Rock Drill Type YN 27C has functions of drillhole,cleavage, bruising, tamping and chiseling. It is widely used in mine, road construction,quarrying, national defence works, etc. Weight of main machine 27 kg Type of carburetor Hand needle valve, no floating type Ignition system Controllable silicon contactless system Displacement of engine piston 185 cm3 Rotating speed of engine ≥2450 r/min Rotating speed of drill rod ≥200 r/min End of drill rod dimensions Hexagonal 22x108 mm Max drilling depth 6 m Tank capacity 1.14 L Drilling speed ≥250mm/min Mixture ratio of gasoline and lubricating oil(in volumes) 12:1 Clearance of spark plug 0.5??0.7 mm